A5001395982- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Complex Systems and Time Series Analysis
- Statistical Mechanics and Entropy
- Clinical Reasoning and Diagnostic Skills
- Radiopharmaceutical Chemistry and Applications
- COVID-19 epidemiological studies
- Radiation Detection and Scintillator Technologies
- Physics of Superconductivity and Magnetism
- Chemical Synthesis and Characterization
- Insurance, Mortality, Demography, Risk Management
- Methane Hydrates and Related Phenomena
- Gamma-ray bursts and supernovae
RIKEN Nishina Center
2021-2024
Kyushu University
2011-2024
Kyoto University
1987-2022
Istituto Nazionale di Fisica Nucleare
2017-2020
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2017-2019
Oak Ridge National Laboratory
2018
Japan Atomic Energy Agency
2016-2017
Osaka University
2012-2016
Saga Medical School Hospital
1990
The momentum correlation functions of $S=\ensuremath{-}2$ baryon pairs ($p{\mathrm{\ensuremath{\Xi}}}^{\ensuremath{-}}$ and $\mathrm{\ensuremath{\Lambda}}\mathrm{\ensuremath{\Lambda}}$) produced in high-energy $pp$ $pA$ collisions are investigated on the basis coupled-channels formalism. strong interaction is described by HAL QCD potential obtained lattice simulations near physical quark masses, while hadronic source function taken to be a static Gaussian form. effect, threshold difference,...
In nuclear structure calculations, the choice of a limited model space, due to computational needs, leads necessity renormalize Hamiltonian as well any transition operator. Here, we present study renormalization procedure and effects Gamow-Teller operator within framework realistic shell model. Our effective shell-model operators are obtained, starting from nucleon-nucleon potential, by way many-body perturbation theory in order take into account degrees freedom that not explicitly included...
The structure of neutron-rich isotopes 60Cr and 62Cr was studied via proton inelastic scattering in inverse kinematics. deformation lengths (delta) for were extracted as 1.12(16) 1.36(14) fm, respectively, providing evidence enhanced collectivity these nuclei. An excited state at 1180(10) keV identified the first time. We adopted 4;{+} its spin parity, leading to rapid increase Ex(4;{+})/E_{x}(2;{+}) ratio, which indicates development large near N=40. Importance admixture gd-shell component...
In this paper we present an evolution of our derivation the shell-model effective Hamiltonian, namely introducing effects three-body contributions. More precisely, consider a potential at next-to-next-to-leading order in chiral perturbation theory, and induced forces that arise from many-body correlations among valence nucleons. The first one is included, Hamiltonian for one- two-valence nucleon-systems, theory. Namely, include only interaction between or two nucleons those belonging to...
The authors tackle the important subject of nuclear matrix elements governing double-$\ensuremath{\beta}$ decay in a first-principles shell-model calculation. They derive effective interaction and Gamow-Teller transition operator from realistic nucleon-nucleon interaction. procedure is tested on two-neutrino decays ${}^{130}$Te ${}^{136}$Xe for which experimental data exist. This test precedes an application to...
Abstract We demonstrate that universal scaling behavior is observed in the current coronavirus (SARS-CoV-2) spread, COVID-19 pandemic, various countries. analyze numbers of infected people who tested positive (cases) 11 selected countries (Japan, USA, Russia, Brazil, China, Italy, Indonesia, Spain, South Korea, UK, and Sweden). By using a double exponential function called Gompertz function, $f_\mathrm{G}(x)=\exp(-e^{-x})$, number cases well described as $N(t)=N_0...
Proton inelastic scattering on the neutron-rich nucleus $^{32}\mathrm{Mg}$ has been studied at 46.5 MeV/nucleon in inverse kinematics. Populated states were identified by measuring de-excitation $\ensuremath{\gamma}$ rays, which five new found $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence analyses. By analyzing angular differential cross sections via coupled-channel calculations, their spins and parities constrained amplitudes for each transition extracted. The...
We present a study of the role played by realistic three-body forces in providing reliable monopole component effective shell-model Hamiltonian. To this end, starting from nuclear potential built up within chiral perturbation theory, we derive Hamiltonians with and without contribution compare results calculations set observables that evidence shell-evolution properties. The testing ground our investigation is nuclei belonging to $fp$ shell, since towards shell closures $^{48}\mathrm{Ca}$...
Three-nucleon force and continuum play important roles in reproducing the properties of atomic nuclei around driplines. Therefore it is valuable to build up a theoretical framework where both effects can be taken into account solve nuclear Schr\"odinger equation. To this end, letter, we have expressed chiral three-nucleon within Berggren representation, so that bound, resonant states treated on an equal footing complex-momentum space. reduce model dimension computational cost, truncated at...
We report in this paper a study terms of the nuclear shell model about location calcium isotopes drip line. The starting point is considering realistic two-body potential derived by Entem and Machleidt within chiral perturbation theory at next-to-next-to-next-to-leading order (N3LO), as well three-body force next-to-next-to-leading (N2LO) whose structure low-energy constants are consistent with potential. Then we construct effective single-particle energies residual interaction needed to...
Extensions of the eikonal approximation to low energy (20 MeV/nucleon typically) are studied. The relation between dynamical (DEA) and continuum-discretized coupled-channels method with (E-CDCC) is discussed. When Coulomb interaction artificially turned off, DEA E-CDCC shown give same breakup cross section, within 3% error, $^{15}\mathrm{C}$ on $^{208}\mathrm{Pb}$ at 20 MeV/nucleon. included, difference appreciable none these models agrees full CDCC calculations. An empirical correction...
Background: Direct evidence of the $\ensuremath{\alpha}\text{-cluster}$ manifestation in bound states has not been obtained yet, although a number experimental studies were carried out to extract information clustering. In particular conventional analyses $\ensuremath{\alpha}\text{-transfer}$ reactions, there exist few significant problems on reaction models, which are insufficient qualitatively discuss cluster structure.Purpose: We aim verify structure from observables. As first...
The structure of the neutron-rich nucleus 58Ti was investigated via proton inelastic scattering in inverse kinematics at a mean energy 42.0 MeV/nucleon. By measuring deexcitation γ rays, three transitions with energies 1046(11) keV, 1376(18) and 1835(27) keV were identified. angle-integrated cross section for 1046-keV excitation, which corresponds to decay from first 2+ state, determined be 13(7) mb. deformation length δp,p′ extracted 0.83−0.30+0.22 fm. state value are comparable ones 56Ti,...
The astrophysical factor of ${}^{8}$B($p$,$\ensuremath{\gamma}$)${}^{9}$C at zero energy, ${S}_{18}(0)$, is determined from three-body model analysis ${}^{9}$C breakup processes. elastic reaction ${}^{208}$Pb(${}^{9}$C,$p{}^{8}$B)${}^{208}$Pb 65 MeV/nucleon and the one-proton removal 285 on C Al targets are calculated with continuum-discretized coupled-channels method (CDCC) eikonal theory (ERT), respectively. asymptotic normalization coefficient (ANC) in $p$-${}^{8}$B configuration,...
We discuss how to extract an electric dipole (E1) breakup cross section |$\sigma ({\mathrm {E1}})$| from one-neutron removal sections measured at 250 MeV/nucleon by using |${}^{12}$|C and |${}^{208}$|Pb targets, _{-1n}^{\mathrm {C}}$| {Pb}}$|, respectively. It is shown that, within about 5% error, can be obtained subtracting |$\Gamma \sigma as assumed in preceding studies. However, for the reaction of weakly bound projectiles, scaling factor $| found twice large that usually adopted. As a...
The hadron-deuteron correlation function has attracted many interests as a potential method to access the three-hadron interactions. However, weakly-bound nature of deuteron not been considered in preceding studies. In this study, breakup effect on deuteron-$\Xi^-$ ($d$-$\Xi^-$) $C_{d\Xi^-}$ is investigated. $d$-$\Xi^-$ scattering described by nucleon-nucleon-$\Xi$ three-body reaction model. continuum-discretized coupled-channels method, which fully quantum-mechanical and non-perturbative...
The three-nucleon force (3NF) is crucial in shaping the shell structure of atomic nuclei, particularly impacting enhancement spin-orbit (SO) splitting, especially nuclei with significant deviations from stability.Despite its importance, specific mechanisms driving this remain unclear.In study, we introduce a decomposition scheme based on rank irreducible tensors forming 3NF, derived chiral effective field theory at next-to-next-to-leading order, to elucidate their influence SO...
The astrophysical factor of $^{8}\mathrm{B}{(p,\ensuremath{\gamma})}^{9}\mathrm{C}$ at zero energy, ${S}_{18}(0)$, is determined by a three-body coupled-channels analysis the transfer reaction $^{8}\mathrm{B}{(d,n)}^{9}\mathrm{C}$ 14.4 MeV/nucleon. Effects breakup channels $d$ and $^{9}\mathrm{C}$ are investigated with continuum-discretized method. It found that, in initial final channels, respectively, process through states $^{9}\mathrm{C}$, its interference that their ground particular,...
The possibility of the $^{8}\mathrm{He}$ and $^{9}\mathrm{Li}$ clusters in atomic nuclei is discussed. Until now most conventional models have been limited to closures three-dimensional harmonic oscillators, such as $^{4}\mathrm{He}$, $^{16}\mathrm{O}$, $^{40}\mathrm{Ca}$. In neutron-rich nuclei, however, neutron-to-proton ratio ($N/Z$) not unity, it worthwhile think about more objects with $N>Z$ building blocks cluster structures. Here neutron number six, which subclosure ${p}_{3/2}$...
We demonstrate that universal scaling behavior is observed in the current coronavirus (SARS-CoV-2) spread, COVID-19 pandemic, various countries. analyze numbers of infected people who tested positive (cases) selected eleven countries (Japan, USA, Russia, Brazil, China, Italy, Indonesia, Spain, South Korea, UK, and Sweden). By using double exponential function called Gompertz function, f G ( x ) = exp(− e − ), number cases well described as N t 0 (γ( )), where , 7 are final cases, damping...
The even-even Ti isotopic chain, from A = 42 to 70, has been studied within the nuclear shell-model framework by employing an effective Hamiltonian which is derived way of many-body perturbation theory a chiral potential with two- and three-body forces, includes contributions account for Pauli principle violations in nuclei more than two valence particles. We consider 40Ca as closed core model space spanned neutron proton 0f1p orbitals addition 0g9/2 orbital neutrons. Calculated two-neutron...